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SELECT JSON_ARRAYAGG( JSON_OBJECT( 'category', c.name, 'film_count', fc.film_count ) ) AS films_by_category FROM ( SELECT c.name, COUNT(fc.film_id) AS film_count FROM category c LEFT JOIN film_category fc ON c.category_id = fc.category_id GROUP BY c.name ) AS category_film_counts; ; show status like 'Last_query_cost';

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